Metal mold for casting iron and steel.



No. 852,671. PATENTED MAY '7, 1907. A. W. MOARTHUR & J. M. DARKE.

METAL MOLD FOB CASTING IRON AND STEEL. APPLICATION FILED D30. 30, 1902.

Ifiventors: I ogi filongo W. Mcfirthun M and Jesse M.Dc1 r-ke, M M

UNITE STATES PATENT oEFIoE.

ALONZO w. McARTHUR, OF SWAMPSCOTT, AND JEssE M. DARKE, OF LYNN,

MASSACHUSETTS, ASSIGNORS TO GENERAL ELECTRIC COMPANY, A con- POEATION OF NEW YORK.

Specification of Letters Patent.

Patented May 7, 1907.

Application filed December 30, 1902. Serial No. 137,145.

I?) all whom, it may concern:

Be it known that we, ALONZO'W. McAR- THUR and JEssE M. DARKE, citizens of the United States, residing, respectively, at Swampscott, county of Essex, State of Massachusetts, and at Lynn, county of Essex, State of Massachusetts, have invented certain new-and useful Improvements in Metal Molds for Casting Iron and Steel, of which the following is a specification.

Our invention relates to metal founding, and has for its object to provide a permanent mold for the production of heat-y iron and steel castings.

Metal molds have been used heretofore in casting ingots and in casting very small pieces such as light gears, but they have not been adapted for making larger castings on account of the ractical'difiicultyin separat ing the mold om the casting and the destruction of the mold due to their welding or burning together. In very small molds it has been practicable to apply washes which would in a'measure prevent the sticking of the castings thereto, but in the larger ones requiring considerable metal it has been impracticable heretofore to fix a wash in place upon the smooth metallic surfaces of the molds so that it would not be removed by the flowing metal.

Our invention consists in coating the inner surfaces of a metal mold with a substance which will adhere thereto in the presence of molten metal and provide a smooth surface to which a refractory wash will adhere sufficient to withstand the erosive effect of the molten metal.

The invention will be more readily understood by reference to the accompanying 49 drawing forming a part of this specification,

' in which Figure 1 is an inner elevation of one side of a mold embodying. one form of our invention and with the gate'and clamping bolts shown in section, and Fig. 2 is a top plan view of the whole mold.

In theanodification of our invention shown in the drawing the mold is of iron, and made in halvesA and B with lugs 2-2 projecting clamping bolts'33 pass, and whereby the halves are held together. The mold has two cavities 4 and 5 and between them a channel 6 which branches at its lower end and connects with the bot-toms of both. cavities.

from the opposite endsthrough which; the

In the channel 6 is located a dry sand gate 7, which may be very inex ensivelylmade In case'jthe and readily fitted to the mo d. mold is to be used for making steel orjlow carbon iron castings the dry sand gate may be made of such a mixture as is used in making facing sand for dry molds or dry cores suitable for steel-foundry use, and in case the mold is used for making grayiron castings the gate maybe made of a mixture ofgsand and clay suitable to resist the action of fluid cast iron.

The smooth inner or face surfaces of the' mold are not adapted to retain in place any of the washes or coatings known at the present time against the action of the flowing metal, and in orderto provide a smooth coating therefor, to which suchwashes or coatings will adhere so as to effectually resist the action of the molten metal, we apply thereto a lining of adhesive material, such as sodium silicate, and dry or fuse it in place bysubjecting the mold to high tem eratures. \Ve have found that the usual si ica washes satisfactorily adhere to a surface thus formed,

' even when the volume of molten metal is relatively large.

By the use of the dry sand gate ,a great quantity of molten metal may be poured into a mold Without cutting of the channel, and when the metal reaches the main cavities of the mold the erosive action is insufiicient to Our invention 18 capable of many changes and modifications without departing from the s irit thereof.

at we claim as new, and desire to se- Q i ,l I 852,671

i cure LettersP atent of the United States, gate and a permanent adhesive lining of 'so- 10 is, I dium silicate fused in lace. 1. A metal mold for casting steel provided In Witness whereof have hereunto set my with a lining consisting of sodium silicate hand this 27th day of December, 1902. 5 'fused in place. VALONZO W. MOARTHUR.

2. A metal mold provided with a perma JESSE M. DARKE. nent adhesive lining of sodium silicate and a Witnesses: j Wash of a refracto material applied thereto. DUGALD MoK. MOKILLOP,

3.- A metal mol provided with a dry sand JOHN A. MCMANUS. 

